Coating apparatus – Projection or spray type – Plural projectors
Patent
1996-09-09
1999-03-02
Ramsey, Kenneth J.
Coating apparatus
Projection or spray type
Plural projectors
B23K 306
Patent
active
058764992
ABSTRACT:
An improved horizontal solder leveller for applying molten solder to boards while removing residual flux therefrom include a single pair of upper and lower solder sparge bars with outlet nozzles arranged so as to direct solder jets from one sparge bar toward the jets from the other sparge bar in the gap formed between the sparge bars. The gap between the sparge bars and the speed of the solder jets is sufficient to remove residual flux from a board passing therethrough as molten solder is applied to the board. An oil guide is included that directs oil to form curtains immediately upstream and downstream of the sparge bar gap to form a barrier to air flow in the gap. An oil trough upstream and downstream of the lower sparge bar limits the vertical extent of the oil curtains. Preferably a pair of castellated infeed rollers and outfeed rollers are used to move boards through the leveller.
REFERENCES:
patent: 4709846 (1987-12-01), Eldenberg
patent: 4928869 (1990-05-01), Lymn
patent: 5038706 (1991-08-01), Morris
patent: 5222650 (1993-06-01), Lymn
patent: 5614264 (1997-03-01), Himes
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